WO2022189083A1 - Efficient multi-band transmitter - Google Patents
Efficient multi-band transmitter Download PDFInfo
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- WO2022189083A1 WO2022189083A1 PCT/EP2022/052942 EP2022052942W WO2022189083A1 WO 2022189083 A1 WO2022189083 A1 WO 2022189083A1 EP 2022052942 W EP2022052942 W EP 2022052942W WO 2022189083 A1 WO2022189083 A1 WO 2022189083A1
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- Prior art keywords
- frequency
- ring oscillator
- signal
- band
- transmitter
- Prior art date
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- 230000005540 biological transmission Effects 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000004590 computer program Methods 0.000 claims description 6
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- 238000010586 diagram Methods 0.000 description 17
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
- H04B1/0082—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
Definitions
- the present invention generally relates to transmitter architectures, and, more particularly, to efficient multi band transmitters.
- Low-power sensor arrays are increasingly used for a variety of applications, including internet of things (loT) devices, implantable devices, wearable devices, energy harvesting systems, seismic sensors, structural health monitoring systems, and multi-channel/multi-mode devices.
- Such transmitters may need to transmit on a variety of different frequency bands, in accordance with the demands of a particular application.
- a transmitter comprises a frequency adjuster coupled to a ring oscillator to reduce latency and power consumption and to receive a signal from the ring oscillator.
- the frequency adjuster includes logic circuits to adjust the signal to a selected transmission frequency band.
- a band switch is coupled to the ring oscillator and the frequency adjuster to select logic circuits within the frequency adjuster to determine the selected transmission frequency band from a set of output frequency bands.
- a first radio front end is coupled to the frequency adjuster to transmit the signal on the selected transmission frequency band.
- a sensor system comprises a sensor that generates measurement data, a ring oscillator-based transmitter, and an antenna that receives a transmitted modulated signal.
- the ring oscillator-based transmitter comprises a frequency adjuster, a band switch, and a first radio front end.
- the frequency adjuster is coupled to a ring oscillator to reduce latency and power consumption and to receive a signal from the ring oscillator.
- the frequency adjuster including logic circuits to adjust the signal to a selected transmission frequency band.
- the band switch is coupled to the ring oscillator and the frequency adjuster to select logic circuits within the frequency adjuster to determine the selected transmission frequency band from a set of output frequency bands.
- the first radio front end is coupled to the frequency adjuster to modulate the measurement data onto the signal and to transmit the signal on the selected transmission frequency band.
- a method for transmitting a signal comprises tuning a ring oscillator output to a base frequency to reduce latency and power consumption.
- the ring oscillator output is switched to a selected transmission band using a frequency adjuster.
- the ring oscillator output is adjusted to a second frequency on the selected transmission band using multiple phase outputs of the ring oscillator.
- the adjusted signal is transmitted on the selected transmission band.
- the method can be performed by a computer program when the program is run on a computer.
- FIG. 1 is a block diagram of a transmission system that uses a ring oscillator to generate a base frequency, which is then adjusted to one of a set of different transmission bands, in accordance with an embodiment of the present invention
- FIG. 2 is a schematic diagram of a ring oscillator that can be used to generate a base frequency for a digitally synthesizable transmitter, in accordance with an embodiment of the present invention
- FIG. 3 is a block diagram of a frequency adjuster that adjusts the base frequency to a selected transmission frequency, in accordance with an embodiment of the present invention
- FIG. 4 is a block diagram of a transmission system that uses a ring oscillator to generate a base frequency, which is then adjusted to one of a set of different transmission bands, in accordance with an embodiment of the present invention
- FIG. 5 is a schematic diagram of a matching network that accepts inputs from a set of different drivers, operating at different frequencies, and matches them to an antenna, in accordance with an embodiment of the present invention
- FIG. 6 is a block/flow diagram of a method for transmitting a signal using a ring oscillator to generate a base frequency, then adjusts the base frequency to one of a set of different transmission bands, in accordance with an embodiment of the present invention
- FIG. 7 is a block diagram of a low-power sensor system that uses a ring oscillator-based transmitter to transmit sensor data on any of a set of different transmission bands, in accordance with an embodiment of the present invention.
- a transmitter may include a single, low-power base oscillator, which may generate a base frequency signal that may then be tuned and modulated for transmission across multiple different bands.
- a ring oscillator that operates at about 900MHz can generate a base frequency signal that, when it is multiplied or divided and tuned appropriately, can be used to transmit on a variety of industrial, scientific, and medical (ISM) radio bands and other useful radio frequencies.
- ISM industrial, scientific, and medical
- a ring oscillator 102 generates a base frequency signal, with a frequency that is based on the physical properties of the oscillator and its components.
- the base frequency signal is adjusted at frequency adjustment 104, for example by multiplying or dividing the frequency of the base frequency signal, before passing to a transmitter array 106.
- Each transmitter array 106 is configured to transmit signals using one or more antennas 108 at a different respective frequency band.
- transmitter arrays 106 also known as radio front ends
- radio front ends each with a respective set of antennas 108
- other embodiments may include a single radio front-end with multiple drivers, each handling a different respective frequency, and feeding a single antenna system using a multiple-input matching network, as described in greater detail below.
- a ring oscillator 102 may be formed as a series of inverters 202 with feedback, so that an output of the final inverter 202 feeds back to the input of the first inverter 202.
- An odd number of inverters 202 may be used, so that when the final inverter 202 inverts its input signal, it will invert the input signal to the first inverter 202.
- an output signal 204 of the ring oscillator 102 will invert periodically, with the period depending on the number of inverters 202 in the ring oscillator 102 and a signal propagation delay that is associated with each such inverter 202.
- the ring oscillator 102 may have multiple outputs 204, each at different points of the ring, to provide different phases.
- the inverters 202 may be implemented as, e.g., complementary metal-oxide semiconductor (CMOS) inverters. Such a structure may be formed from a p-channel metal-oxide semiconductor (PMOS) transistor and an n- channel metal-oxide semiconductor (NMOS) transistor, connected in series. The respective transistors turn on when a threshold voltage is reached, thereby changing the output of that delay stage. Some small amount of time is needed for charge to accumulate to this point, making up the inversion delay. Thus, each inverter 202 will contribute to the total period of the ring oscillator 102. The delay may be adjusted by affecting the delay of each inverter stage 202, for example by changing a bias voltage value or by changing a capacitance.
- CMOS complementary metal-oxide semiconductor
- a voltage 206 may be applied to start the oscillation, and the oscillation will continue as long as the voltage is maintained. Additionally, the frequency may be tuned by altering the input voltage, which changes the signal propagation delay for the inverters 202. An increased input voltage may decrease the propagation delay, thereby increasing the frequency of the output signal 204. This voltage may be about 0.5V, making it possible to run the oscillator from low-voltage power sources, such as solar cells, coin batteries, and energy harvesters. Using such low- power operation, a ring oscillator-based transistor may be helpful in embedded sensor systems, where limited power may be available and where it may be inconvenient to manually replace depleted power sources.
- the frequency may also be tuned by controlling an array of tuning capacitors, with each capacitor in the array being associated with a respective inverter 202.
- the tuning capacitors control the rate at which the respective inverters 202 are charged, and so control the rate at which a signal propagates through the ring oscillator 102.
- These tuning capacitors may have a capacitance that can switch between a high-capacitance mode and a low capacitance mode, providing for a range of frequency tuning between the state where all of the inverters 202 have their respective tuning capacitors in a high-capacitance mode, and a state where all of the inverters 202 have their respective tuning capacitors in a low-capacitance mode.
- the operation of the tuning capacitors thereby changes the inversion delay of the respective inverter 202 between a high-capacitance value and a low-capacitance value.
- the resulting frequency of the ring oscillator 102 may then be determined as: where t h is the high-capacitance value of the inverter delay, is the low-capacitance value of the inverter delay, and n is a fraction of the inverters 202 in the high-capacitance configuration. It should be understood that capacitors with more than two capacitance states are also contemplated, and their contribution to the ring oscillator frequency may be adjusted accordingly.
- a ring oscillator 102 may settle within one clock period of the clock frequency. For example, if a ring oscillator operates at 2GHz, then it would settle within about 500ps. This contrasts to L/C oscillators, which may take an amount of time that is a multiple of the fundamental period, depending on the quality factor of the L/C oscillator's resonator tank. For example, with a quality factor of 10, an L/C oscillator may take 5ns to settle. The shorter wakeup time of ring oscillators makes it possible to perform transmit and receive functions with very low latency. As a result, a sensor system that uses such an oscillator for transmissions may keep the oscillator turned off when not needed, providing a power saving without compromising latency. Additionally, because the oscillator needs to run far less time before settling, the ring oscillator may waste significantly less energy during startup than an L/C oscillator.
- Multiple phases may be extracted from the ring oscillator 102 by including multiple outputs 204.
- the different outputs will sample the oscillating signal at different points in its wavelength. Any number of such outputs 204 may be used, establishing any number of delay cells. For example, with N delay cells, two phases may be obtained that are 180 IN degrees apart. Thus, with two delay cells (two outputs 204), the phases may be placed 90° apart, or roughly one quarter of the length of the ring oscillator 102. In some cases, different outputs 204 may be used to realize different phase granularities. Any configuration with an even number of evenly spaced outputs 204 will have outputs that are 90° apart, which may be used for in-phase and quadrature signal generation.
- the length of the ring oscillator 102 may be selected to produce a base frequency for the output signal 204 that is the geometric mean of the extreme frequencies of the bands that will be used. For example, consider a transmitter 100 that will transmit on the following ISM bands: 170MHz, 315MHz, 433MHz, 900MHz, 2400MHz, and 5200MFIz. The lowest frequency is 170MHz and the highest frequency is 5200MHz, making the geometric mean (940MHz) close to 900MFIz. As such, the base frequency of the output signal may be set to 900MHz, which may be used directly for 900MHz operation, and which may be adjusted to operate on higher or lower frequency bands.
- frequency bands are specifically contemplated, it should be understood that any appropriate frequency bands may be used instead, including those that are higher in frequency than 5200MHz and those that are lower in frequency than 170MHz. Additionally, while bands that are roughly integer multiples of one another are specifically contemplated, it should be understood that bands may be used which do not conform to this pattern, if appropriate changes are made to the frequency adjustment block 104.
- the output signal 204 from the ring oscillator 102 is processed by a band switch 301, which is controlled to select which band or bands will be used for transmission.
- the signal 204 from the ring oscillator may be set to a base frequency of 900MFIz.
- the frequency adjustment block 104 takes a single input and generates one of five different outputs, corresponding to five different bands. It should be understood that more or fewer bands may be used instead, in accordance with the communications needs of the device.
- a set of frequency adjusters are shown that convert the base frequency of the signal 204 to a transmission band, selected from any of a set of different bands. For example, using an input of 900MHz, a divide by five frequency divider 302 generates a signal 303 at 180MHz, which can be tuned into the range of the 170MHz band. A divide by three frequency divider 304 generates a signal 305 at 300MHz, which can be tuned into the range of the 315MHz band. A buffer 306 can be used to provide an output signal 307 at 900MHz, the same as the signal 204 from the ring oscillator 102. A multiply by three frequency multiplier 308 generates a signal 309 at 2700MHz, which can be tuned into the range of the 2400MHz band.
- a multiply by five frequency multiplier generates a signal 311 at 5400MHz, which can be tuned into the range of the 5200MFIz.
- Other frequencies such as a 433MFIz output, can be reached using similar circuits.
- a 433MFIz output can be generated by dividing the frequency of the output signal 204 by two, producing 450MHz, which can be tuned into the range of 433MFIz.
- the divide by five frequency divider 302 and the divide by three frequency divider 304 may be implemented with a frequency divider and a capacitive digital to analog converter phase multiplexer, which can divide the base frequency to any appropriate fraction. This can be performed by using multiple phases from the ring oscillator 102, with the capacitive digital to analog converter to generate a sinusoidal signal.
- signals with orthogonal phases may be merged to provide an output signal at a frequency multiple of the input signal.
- Such orthogonal phases may be generated from the different outputs 204 of the ring oscillator 102.
- filtering can be performed using passive elements in resonance.
- the frequency multipliers may thus be implemented as, e.g., distinct logic circuits.
- XOR circuits having phase-shifted inputs may be used.
- an XOR3 circuit may multiply a frequency of an input by a factor of three, if the input signal is applied to the three inputs of the XOR3 circuit with different amounts of phase shift.
- the frequency adjustment 104 may output to a transmitter array 402 having multiple drivers 404.
- Each driver 404 may receive a different respective frequency input from the frequency adjustment block 104.
- the drivers 404 may then output a respective transmission signal.
- Each of the drivers 404 may be separately configured as, e.g., single-ended or differential drivers.
- a matching network 406 matches impedance between the operating driver 404, which provides the transmission at its respective input frequency, and an antenna 408 or antenna array.
- any of the drivers 404 may be enabled at a given time, with the rest being turned off.
- the antenna 408 may be a wide-band antenna that supports closely spaced frequency bands, covering the tuning range of the base frequency. Following the above examples of the bands in use, the antenna 408 may have a standing wave ratio (SWR) of less than 1:1.5 over an exemplary frequency range of 868— 915MHz.
- the matching network 406 provides resonance at any of the respective input frequencies.
- on-chip drivers can be configured as single-ended or differential as needed.
- the matching network 406 is configured to accept inputs from all of the different drivers 404, with a number of connections between the drivers 404 and the matching network 406 reflecting whether the respective driver 404 is in a single-ended configuration or a differential configuration. Only a subset of drivers 404 are shown in FIG. 5 for the sake of simplicity, but it should be understood that any number of drivers 404 may be connected to such a matching network 406.
- a set of drivers 404 operating at different respective frequencies, provide inputs to the matching network 406 at different stages, with the inductors 502 and capacitors 504 having values that are selected to provide impedance matching to a single output impedance 506, matching to the antenna 408.
- the first and third drivers 404 are configured to provide a differential output
- the second driver 404 is configured to provide a single- ended output.
- the inductors 502 may have exemplary inductances between about 1nH and about 5nH
- the capacitors 504 may have exemplary capacitances between about 1 pF and about 3pF. These values are selected to adjust the effective impedance of the antenna 408 to be appropriate for resonance with the output frequency of the selected driver 404.
- Block 602 determines an operating frequency, among multiple available bands and the respective frequency ranges for each of the bands. This selection may be made in accordance with any of a number of factors, for example including an operating frequency of a device available in the environment, regulatory considerations, noise levels, etc.
- Block 604 then tunes the ring oscillator 102 to generate a corresponding frequency on the base band. For example, if a frequency is selected in the 170MHz band, then block 604 tunes the local oscillator 102 to a frequency that, when it is adjusted by frequency adjuster 104, will produce the operating frequency. As described above, this may be performed by adjusting capacitances at each delay stage of the ring oscillator 102.
- Block 606 then operates the band switch 301 to connect the output(s) of the local oscillator to a respective modification block, corresponding to the band that includes the operating frequency.
- this band switch 301 may include a switch that selectively connects the local oscillator to the respective modification block.
- the band switch 301 may control power to the respective transmitter array 106 or the respective driver 404 that corresponds to the operating frequency.
- Block 608 modulates the modified signal with any appropriate data signal, using any appropriate modulation scheme.
- quadrature amplitude modulation QAM
- QAM quadrature amplitude modulation
- phase-shift keying may be used, for example by adjusting the phase of a phase-locked loop. Modulation may be implemented at any appropriate stage, after the frequency has been adjusted.
- Block 610 then transmits the modulation signal.
- This transmission may be performed using one or more antennas, for example in a phased array configuration, to provide a signal that is directed to a particular target.
- block 210 may configure the antenna(s) in accordance with a particular beam steering direction by providing multiple output signals, phase-shifted with respect to one another, to different respective antennas.
- the entire transmitter and receiver can be synthesized using digital logic. This is particularly useful for designing radios in scaled CMOS nodes, and for faster time to market solutions. The entire radio can be designed using standard logic cells provided in a digital technology, and be targeted for lower power.
- the present invention may be a system, a method, and/or a computer program product at any possible technical detail level of integration
- the computer program product may include a computer readable storage medium (or media) having computer readable program instructions thereon for causing a processor to carry out aspects of the present invention
- the computer readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device.
- the computer readable storage medium may be, for example, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing.
- a non-exhaustive list of more specific examples of the computer readable storage medium includes the following: a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanically encoded device such as punch-cards or raised structures in a groove having instructions recorded thereon, and any suitable combination of the foregoing.
- RAM random access memory
- ROM read-only memory
- EPROM or Flash memory erasable programmable read-only memory
- SRAM static random access memory
- CD-ROM compact disc read-only memory
- DVD digital versatile disk
- memory stick a floppy disk
- a mechanically encoded device such as punch-cards or raised structures in a groove having instructions recorded thereon
- a computer readable storage medium is not to be construed as being transitory signals perse, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission media (e.g., light pulses passing through a fiber-optic cable), or electrical signals transmitted through a wire.
- Computer readable program instructions described herein can be downloaded to respective computing/processing devices from a computer readable storage medium or to an external computer or external storage device via a network, for example, the Internet, a local area network, a wide area network and/or a wireless network.
- the network may comprise copper transmission cables, optical transmission fibers, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers.
- a network adapter card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium within the respective computing/processing device.
- Computer readable program instructions for carrying out operations of the present invention may be assembler instructions, instruction-set-architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state-setting data, configuration data for integrated circuitry, or either source code or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C++, or the like, and procedural programming languages, such as the "C” programming language or similar programming languages.
- the computer readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server.
- the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).
- electronic circuitry including, for example, programmable logic circuitry, field-programmable gate arrays (FPGA), or programmable logic arrays (PLA) may execute the computer readable program instructions by utilizing state information of the computer readable program instructions to personalize the electronic circuitry, in order to perform aspects of the present invention.
- These computer readable program instructions may be provided to a processor of a computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
- These computer readable program instructions may also be stored in a computer readable storage medium that can direct a computer, a programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer readable storage medium having instructions stored therein comprises an article of manufacture including instructions which implement aspects of the function/act specified in the flowchart and/or block diagram block or blocks.
- the computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other device to produce a computer implemented process, such that the instructions which execute on the computer, other programmable apparatus, or other device implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
- such phrasing is intended to encompass the selection of the first listed option (A) only, or the selection of the second listed option (B) only, or the selection of the third listed option (C) only, or the selection of the first and the second listed options (A and B) only, or the selection of the first and third listed options (A and C) only, or the selection of the second and third listed options (B and C) only, or the selection of all three options (A and B and C).
- This may be extended, as readily apparent by one of ordinary skill in this and related arts, for as many items listed.
- each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s).
- the functions noted in the blocks may occur out of the order noted in the Figures.
- two blocks shown in succession may, in fact, be accomplished as one step, executed concurrently, substantially concurrently, in a partially or wholly temporally overlapping manner, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
- the term "hardware processor subsystem” or “hardware processor” can refer to a processor, memory, software or combinations thereof that cooperate to perform one or more specific tasks.
- the hardware processor subsystem can include one or more data processing elements (e.g., logic circuits, processing circuits, instruction execution devices, etc.).
- the one or more data processing elements can be included in a central processing unit, a graphics processing unit, and/or a separate processor- or computing element- based controller (e.g., logic gates, etc.).
- the hardware processor subsystem can include one or more on-board memories (e.g., caches, dedicated memory arrays, read only memory, etc.).
- the hardware processor subsystem can include one or more memories that can be on or off board or that can be dedicated for use by the hardware processor subsystem (e.g., ROM, RAM, basic input/output system (BIOS), etc.).
- the hardware processor subsystem can include and execute one or more software elements.
- the one or more software elements can include an operating system and/or one or more applications and/or specific code to achieve a specified result.
- the hardware processor subsystem can include dedicated, specialized circuitry that performs one or more electronic processing functions to achieve a specified result.
- Such circuitry can include one or more application-specific integrated circuits (ASICs), FPGAs, and/or PLAs.
- the system 700 includes a hardware processor and a memory 704.
- Sensor 706 may include one or more sensor components, each providing a measurement of one or more phenomena.
- the sensor 706 may be an electromagnetic sensor, capable of detecting electromagnetic radiation, such as an infrared sensor or a light sensor.
- Other examples of sensors include pressure sensors, sound sensors, vibration sensors, temperature sensors, humidity sensors, chemical sensors, etc.
- Sensor 706 may be on-board, as shown, or may communicate with the system 700 by any appropriate communications interface and protocol.
- a power source 708 provides electrical power to a ring oscillator-based multi-band transmitter 710.
- the power source 708 may be any appropriate source, such as a battery, a solar cell, a vibrational power generator, a piezoelectric power generator, any appropriate on-board or off-board power generator, or an external power source. It is specifically contemplated that the power source 708 may have a relatively small size, making it possible to implement the system 700 in a cost-effective and space-efficient manner.
- the transmitter 710 uses a ring oscillator 102 to provide a base frequency signal in a manner that is more efficient than L/C tank oscillators.
- the transmitter 710 adjusts the signal from the base frequency to any appropriate transmission band.
- the transmitter 710 may modulate data onto the adjusted signal, for example modulating the signal to include measurements from sensor 706.
- the transmitter 710 provides the modulated signal to antenna 712.
- Antenna 712 may use any appropriate antenna configuration, such as a single wide-band antenna or a phased antenna array.
- antenna 712 may include a different antenna configuration for each band that may be used by the transmitter 710.
- antenna 712 may include an antenna configuration for a single band, in which case the transmitter 710 may include a matching network 406 to bring antenna 712 into resonance at the transmission frequency.
- antenna 712 may include a phased array that has multiple antenna elements. In such cases, each of the antenna elements may transmit the same signal, but phase-shifted by differing amounts.
- the transmitted signals interfere with one another, in some places constructively and in some places destructively, providing a potentially very focused transmission pattern.
- the transmitter 710 may therefore include a phase shifter on each transmission path leading to the respective antenna elements of antenna 712, and the phase values of these phase shifters may be adjusted in accordance with particular beam patterns.
Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP22708056.1A EP4305757A1 (en) | 2021-03-12 | 2022-02-08 | Efficient multi-band transmitter |
JP2023546083A JP2024509686A (en) | 2021-03-12 | 2022-02-08 | Efficient multi-band transmitter |
CN202280020254.2A CN117083807A (en) | 2021-03-12 | 2022-02-08 | High efficiency multi-band transmitter |
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US17/199,998 | 2021-03-12 | ||
US17/199,998 US11496164B2 (en) | 2021-03-12 | 2021-03-12 | Efficient multi-band transmitter |
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WO2022189083A1 true WO2022189083A1 (en) | 2022-09-15 |
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PCT/EP2022/052942 WO2022189083A1 (en) | 2021-03-12 | 2022-02-08 | Efficient multi-band transmitter |
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US11923861B1 (en) * | 2023-02-03 | 2024-03-05 | Qualcomm Incorporated | Wideband rail-to-rail voltage controlled oscillator |
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CN117083807A (en) | 2023-11-17 |
EP4305757A1 (en) | 2024-01-17 |
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